Still can't keep engine cool with A/C on - Chevy Impala SS Forum
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post #1 of 37 (permalink) Old 06-13-2017, 07:46 PM Thread Starter
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Angry Still can't keep engine cool with A/C on

New engine - installed last week. I'm thinking that the new engine is generating a lot more HP (duh) so thereby its generating a lot more heat - and the single-row OEM can't handle the heat load of the engine and the heat from the condenser.

New radiator, tank, tank cap, hoses, 50/50 mix, new 160 t-stat, PCM programmed for it, new fan motors, new water pump, system bled to death, all the baffles and air-guides are in-place. This has been an issue I've fought for a long time, as you can see from the parts list - dating back to the previous 383. The car just has not been able to stay acceptably cool in ATL traffic with the AC on. (And the entire AC system is new too - down to the lines...) Car stays nice and cool with the AC off and will sit there in traffic all day at 95 degrees. Flick the AC on and up goes the temp.... and the AC works fabulously regardless.

No coolant in the oil or vice versa. Car runs like a scalded dog.

I'm flat out of ideas. Everything has been tried and nothing is working. The final thing I've been eyeballing is a two-row BeCool or Griffin, but they are really pricey.

Has anyone run one of these with any success?


1995 Caprice ERE 383, CIA long tubes, Dynomax VT's, RAISS, Kore3/Z06 brakes, 3.42 posi, Boss 338 20's, 12 way seats, Impala SS console, etc etc etc
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post #2 of 37 (permalink) Old 06-13-2017, 08:05 PM
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Have you verified that the fans are working correctly, even though they both have new motors?

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post #3 of 37 (permalink) Old 06-13-2017, 08:19 PM Thread Starter
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Quote:
Originally Posted by threeimpalas View Post
Have you verified that the fans are working correctly, even though they both have new motors?
Great thought. Yes, they both are working perfectly, though
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post #4 of 37 (permalink) Old 06-13-2017, 09:14 PM
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In addition to reducing any air-flow around the radiator,and forcing as much as possible thru radiator. I enhanced the air-dam system under the core support to encourage more flow... All that being said,you're probably "on the bubble" with needing a radiator with more capacity.... An electric W/P may pay dividends provided you don't have one already.

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post #5 of 37 (permalink) Old 06-13-2017, 11:29 PM
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Do you have some numbers? Temp gauge can be notoriously inaccurate.

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post #6 of 37 (permalink) Old 06-14-2017, 06:21 AM
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post the radiator part number and manufacturer also what is the temp ? in degrees and how does it change when stopped and at hywy speeds.

who made the fans and do they fit properly in the fan shroud .. post pictures .

both fans should be on if engine temp goes up to 225F and higher.

Last edited by j cat; 06-14-2017 at 06:23 AM.
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post #7 of 37 (permalink) Old 06-14-2017, 09:08 AM Thread Starter
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Car has been tuned for 160 t-stat, so both fans are on and running pretty much constantly. Radiator is the Spectra Premium one - good ol' Autozone special. Its a single-row with the 1" core. No ATF running through it either - I've got that going to an external cooler. In town, with the AC off, the needle goes up less than 1/4 off the peg - and the car doesn't care how long you sit in traffic or how hot the ambient temps are. Flick on the AC, and if you're moving, the temp goes up to 1/4 - 1/3. Within minutes of stopping for traffic - it goes to 1/2 to a tick over half - and that's as hot as I've ever let it get before I turn off the air. On the interstate with the AC on, it goes to 1/4 to a shade over 1/4.

I will plug in my cable and get some hard-data off the temp sensor and post back.

Does anyone know the correct voltage for the fan leads?


1995 Caprice ERE 383, CIA long tubes, Dynomax VT's, RAISS, Kore3/Z06 brakes, 3.42 posi, Boss 338 20's, 12 way seats, Impala SS console, etc etc etc
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post #8 of 37 (permalink) Old 06-14-2017, 09:13 AM
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There are 3 row radiators on ebay. Here is one: KKS 3 ROW STAMP TANK ALL ALUMINUM RADIATOR 94-96 CHEVY Caprice/Impala 4.3 5.7L | eBay

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For a parts list, check http://www.impalassforum.com/vBullet...ion-parts.html
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post #9 of 37 (permalink) Old 06-14-2017, 09:22 AM Thread Starter
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Quote:
Originally Posted by Fred Kiehl View Post
Thanks Fred. I saw those last night when I was looking around, but I didn't know how trustworthy they were. Plus, my own anecdotal evidence of using a 2 row and a 3 row on my 66 Chevelle showed exactly zero difference in temps between the two - so I'd probably stick to the two-row for space. That, and BeCool and Griffin are both reputable names in the industry. The eBay ones are an unknown quantity.


1995 Caprice ERE 383, CIA long tubes, Dynomax VT's, RAISS, Kore3/Z06 brakes, 3.42 posi, Boss 338 20's, 12 way seats, Impala SS console, etc etc etc
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post #10 of 37 (permalink) Old 06-14-2017, 10:35 AM
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well you have replaced everything but the 383 with the summer heat looks to be to much for the "stock" cooling system.

When I am in Vegas when it is 118+ out my temps get higher but only about 1/2 gauge max in stop/go traffic with AC on. Otherwise the needle sits at the 1/4 mark

I have a FSR 2 row. No coolers in the radiator. Also a EWP

\'96 BBB 383/T-56
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